TWOMASSRSC - 2MASS Redshift Survey (2MRS) Catalog

This table is based on the results of the 2MASS Redshift Survey
(2MRS), a ten-year project to map the full three-dimensional distribution of
galaxies in the nearby universe. The Two Micron All Sky Survey (2MASS) was
completed in 2003 and its final data products, including an extended source
catalog (XSC), are available online. The 2MASS XSC contains nearly a million
galaxies with Ks <= 13.5 mag and is essentially complete and mostly
unaffected by interstellar extinction and stellar confusion down to a galactic
latitude of |b| = 5 degrees for bright galaxies. Near-infrared wavelengths are
sensitive to the old stellar populations that dominate galaxy masses, making
2MASS an excellent starting point to study the distribution of matter in the
nearby universe. The authors selected a sample of 44,599 2MASS galaxies with
Ks <= 11.75 mag and |b| >= 5 degrees (>= 8 degrees toward the Galactic bulge)
as the input catalog for their survey. They obtained spectroscopic observations
for 11,000 galaxies and used previously obtained velocities for the remainder
of the sample to generate a redshift catalog that is 97.6% complete to
well-defined limits and covers 91% of the sky. This provides an unprecedented
census of galaxy (baryonic mass) concentrations within 300 Mpc. Earlier
versions of their survey have been used in a number of publications that have
studied the bulk motion of the Local Group, mapped the density and peculiar
velocity fields out to 50 h-1 Mpc, detected galaxy groups, and estimated the
values of several cosmological parameters. Additionally, the authors present
morphological types for a nearly complete sub-sample of 20,860 galaxies with
Ks <= 11.25 mag and |b| >= 10 degrees.

The authors initially selected 45,086 sources which met the following criteria:

They rejected 324 sources of galactic origin (multiple stars, planetary
nebulae, and H II regions) or pieces of galaxies detected as separate sources
by the 2MASS pipeline. Additionally, they flagged 314 bona fide galaxies with
compromised photometry for reprocessing at a future date. Some of these
galaxies have bright stars very close to their nuclei which were not detected
by the pipeline. Others are in regions of high stellar density and their
center positions and/or isophotal radii have been incorrectly measured by the
pipeline. Lastly, some are close pairs or multiples but the pipeline only
identified a single object. A detailed explanation of the steps taken to
reject and reprocess the flagged galaxies is given in the Appendix of the
reference paper.

In summary, the final input catalog contained here has 44,599 entries (plotted
using black symbols in Figure 1 of the reference paper). In this table,
redshifts for 43,533 of the selected galaxies, or 97.6% of the sample, are
presented.

Ks_Mag_0
The extinction-corrected isophotal Ks magnitude of the galaxy
measured in an elliptical aperture defined at the Ks = 20 magnitudes per
square arcsecond isophote. The modest extinction correction that was applied
to the 2MASS XSC or LGA magnitudes was based on the maps of Schlegel et al.
(1998, ApJ, 500, 525).

Ks_Mag_0_Error
The uncertainty in the value of the corresponding magnitude.

Hmag_0
The extinction-corrected isophotal H magnitude of the galaxy
measured in an elliptical aperture defined at the Ks = 20 magnitudes per
square arcsecond isophote. The modest extinction correction that was applied
to the 2MASS XSC or LGA magnitudes was based on the maps of Schlegel et al.
(1998, ApJ, 500, 525).

Hmag_0_Error
The uncertainty in the value of the corresponding magnitude.

Jmag_0
The extinction-corrected isophotal J magnitude of the galaxy
measured in an elliptical aperture defined at the Ks = 20 magnitudes per
square arcsecond isophote. The modest extinction correction that was applied
to the 2MASS XSC or LGA magnitudes was based on the maps of Schlegel et al.
(1998, ApJ, 500, 525). Values of this parameter of 99.999 in the original table
were turned to nulls in the HEASARC version of this table.

Jmag_0_Error
The uncertainty in the value of the corresponding magnitude.
Values of this parameter of 9.999 in the original table
were turned to nulls in the HEASARC version of this table.

Ks_Mag_0_Tot
The extinction-corrected "total" extraoplated Ks magnitude
of the galaxy as derived by the 2MASS photometric pipeline. The modest
extinction correction that was applied to the 2MASS XSC or LGA magnitudes was
based on the maps of Schlegel et al. (1998, ApJ, 500, 525).

Hmag_0_Tot
The extinction-corrected "total" extraoplated H magnitude
of the galaxy as derived by the 2MASS photometric pipeline. The modest
extinction correction that was applied to the 2MASS XSC or LGA magnitudes was
based on the maps of Schlegel et al. (1998, ApJ, 500, 525).

Hmag_0_Tot_Error
The uncertainty in the value of the corresponding
magnitude. Values of this parameter of 9.999 in the original table
were turned to nulls in the HEASARC version of this table.

Jmag_0_Tot
The extinction-corrected "total" extraoplated J magnitude
of the galaxy as derived by the 2MASS photometric pipeline. The modest
extinction correction that was applied to the 2MASS XSC or LGA magnitudes was
based on the maps of Schlegel et al. (1998, ApJ, 500, 525).

Jmag_0_Tot_Error
The uncertainty in the value of the corresponding
magnitude. Values of this parameter of 9.999 in the original table
were turned to nulls in the HEASARC version of this table.

Reddening
The foreground Galactic reddening E(B-V), in magnitudes, towards
the galaxy, based on the maps of Schlegel et al. (1998, ApJ, 500, 525).

Log_K20_Semimajor_Axis
The logarithm of the Ks = 20 mag arcsec-2
elliptical isophote's semi-major axis of the galaxy, in arcseconds.

Log_Tot_Semimajor_Axis
The logarithm of the "total magnitude"
extraopolation semi-major axis of the galaxy, in arcseconds.

Axis_Ratio
The axial ratio, b/a, of the (J + H + Ks) co-added image
of the galaxy at the 3-sigma isophote. Values of this parameter of 9.999 in
the original table were turned to nulls in the HEASARC version of this table.

Xsc_Ppc_Flags
The 2MASS XSC database pipeline photometry confusion flags
for the galaxy (cc_flg, k_flg_k20fe, h_flg_k20fe, j_flg_20kfe).
"Z" in the first character indicates that the magnitudes are from the
2MASS LGA.

Morph_Type
The morphological type of the galaxy, expressed using the ZCAT
convention as discussed in Section 5 and Table 5 of the reference paper.
It is a five digit code (I2, A1, I1, and A1). The first two digits are the
numerically coded T type, the next letter (if present) is the Bar type, the
next digit (if present) is the numerically coded luminosity class, and the
final letter (if present) denotes morphological perculiarities.

Ref_Radial_Velocity
The NED bibliographic code for the source of the
radial velocity taken from one of the 578 references listed in Table 4 of
the reference paper. The authors strongly encourage proper citation of
the original publications when making use of any of these values.